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number.lua cleanup, tostring fixes

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This commit is contained in:
Lars Mueller 2020-12-19 14:41:03 +01:00
parent 0579840908
commit 3a5b436e11
1 changed files with 41 additions and 40 deletions
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81
number.lua
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@ -1,50 +1,51 @@
-- Make random random -- Make random random
math.randomseed(minetest.get_us_time()) math.randomseed(minetest.get_us_time())
for i = 1, 100 do for _ = 1, 100 do math.random() end
math.random()
end function round(number, steps)
-- Number helpers steps = steps or 1
function round(number, steps) -- Rounds a number return math.floor(number * steps + 0.5) / steps
steps = steps or 1
return math.floor(number * steps + 0.5) / steps
end end
local c0 = ("0"):byte() local c0 = ("0"):byte()
local cA = ("A"):byte() local cA = ("A"):byte()
function default_digit_function(digit) function default_digit_function(digit)
if digit <= 9 then if digit <= 9 then return string.char(c0 + digit) end
return string.char(c0+digit) return string.char(cA + digit - 10)
end
return string.char(cA+digit-10)
end end
default_precision = 10 default_precision = 10
-- See https://github.com/appgurueu/Luon/blob/master/index.js#L724
function tostring(number, base, digit_function, precision) function tostring(number, base, digit_function, precision)
digit_function = digit_function or default_digit_function digit_function = digit_function or default_digit_function
precision = precision or default_precision precision = precision or default_precision
local out = {} local out = {}
if number < 0 then if number < 0 then
table.insert(out, "-") table.insert(out, "-")
number = -number number = -number
end end
local digit number = number + base ^ -precision / 2
while number >= base do local digit
digit = math.floor(number % base) while number >= base do
table.insert(out, digit_function(digit)) digit = math.floor(number % base)
number = number / base table.insert(out, digit_function(digit))
end number = number / base
digit = math.floor(number) end
table.insert(out, digit_function(digit)) digit = math.floor(number)
modlib.table.reverse(out) table.insert(out, digit_function(digit))
number = number % 1 modlib.table.reverse(out)
if number >= math.pow(base, precision) then number = number % 1
table.insert(out, ".") if number ~= 0 and number >= base ^ -precision then
-- precision >= 0 eventually redundant table.insert(out, ".")
while precision >= 0 and number >= math.pow(base, precision) do while precision >= 0 and number >= math.pow(base, precision) do
number = number * base number = number * base
digit = math.floor(number % base) digit = math.floor(number % base)
table.insert(out, digit_function(digit)) table.insert(out, digit_function(digit))
number = number - digit number = number - digit
precision = precision - 1 precision = precision - 1
end end
end end
return table.concat(out) return table.concat(out)
end end